Five members of staff at the Wensleydale Creamery have tested positive for coronavirus.
The employees all work in the production area at the Hawes site and all production staff will now be tested for Covid-19, bosses say.
The company added that several members of staff were now isolating as a result of their colleagues’ positive tests.
There have been no confirmed cases in the visitor centre, which remains fully open, the company said.
Public Health England and North Yorkshire County Council have both been informed and are working with the business.
A spokesperson for the Wensleydale Creamery said: “Five colleagues who work within our production area have tested positive for Covid-19.
“We have responded quickly, working collaboratively with Public Health England and North Yorkshire County Council, to provide tests for all members of our production team and ensure that effective and appropriate measures are in place to contain the spread of the virus.”
The company said the factory was an A* International Food Safety accredited site with 5/5 Food Standards Agency rating and they were committed to maintaining the highest standard of hygiene.
“We have been following strict procedures within our production areas and as an additional precautionary measure, further members of staff are now isolating.
“There have been no cases detected at our separate Wensleydale Creamery Visitor Centre which remains fully open.
“Since our phased reopening, we have put in place stringent measures to maintain a safe and welcoming environment for our employees and visitors, including two-metre social distancing in all areas, frequent comprehensive cleaning, one way systems with separate entrances, hand sanitisers throughout each area, along with daily employee temperature checks.”
The company said it would work closely with local authorities to ensure the safety of its staff, customers and visitors, and urged anyone experiencing symptoms to remain at home and self-isolate.
Jill McMullon, chair of Hawes and High Abbotside Parish Council, said: “I understand there have been several confirmed cases at the creamery.
“I’m sure they will take every step necessary to keep people safe.”